How to Use TPS54x60: Examples, Pinouts, and Specs

The TPS54x60 is a high-efficiency, step-down (buck) DC-DC converter designed for powering processors, FPGAs, ASICs, and other devices requiring a stable power supply. Manufactured by Texas Instruments, this component integrates power MOSFETs and offers a wide input voltage range, adjustable output voltage, and high current capability. Its compact design and robust features make it ideal for portable devices, industrial systems, and telecom applications.

• Powering microprocessors, DSPs, and FPGAs
• Industrial automation systems
• Portable electronics
• Telecom and networking equipment
• Battery-powered devices

Below is the pinout for the TPS54x60 in the HTSSOP package:

1. Input Voltage Supply: Connect the VIN pin to a stable DC power source within the range of 4.5 V to 60 V.
2. Output Voltage Configuration: Use a resistor divider network connected to the FB pin to set the desired output voltage. Refer to the formula in the datasheet for precise calculations.
3. Inductor and Capacitor Selection: Choose an inductor and output capacitor based on the desired output voltage, current, and ripple requirements. Refer to the datasheet for recommended values.
4. Switching Frequency: Connect a resistor to the RT/CLK pin to set the switching frequency. Alternatively, provide an external clock signal for synchronization.
5. Enable/Disable: Use the EN pin to enable or disable the device. Pull it high to enable and low to disable.
6. Bootstrap Capacitor: Connect a small ceramic capacitor (typically 0.1 µF) between the BOOT and SW pins for proper operation of the high-side MOSFET.

• Ensure proper thermal management by using a PCB with adequate copper area for heat dissipation.
• Use low-ESR capacitors for input and output filtering to minimize noise and ripple.
• Follow the layout guidelines in the datasheet to reduce EMI and ensure stable operation.
• Avoid exceeding the maximum input voltage and output current ratings to prevent damage.

The TPS54x60 can be used to power an Arduino UNO by stepping down a higher voltage (e.g., 12 V) to 5 V. Below is an example circuit and Arduino code to monitor the output voltage:

1. Connect a 12 V DC power source to the VIN pin of the TPS54x60.
2. Set the output voltage to 5 V using a resistor divider on the FB pin.
3. Connect the output of the TPS54x60 to the 5 V pin of the Arduino UNO.
4. Use the Arduino's analog input to monitor the output voltage.

// Define the analog pin connected to the TPS54x60 output
const int voltagePin = A0;

// Define the reference voltage and resistor divider ratio
const float referenceVoltage = 5.0; // Arduino's ADC reference voltage
const float resistorDividerRatio = 1.0; // Adjust based on your resistor divider

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  // Read the analog value from the voltage pin
  int analogValue = analogRead(voltagePin);

  // Convert the analog value to voltage
  float outputVoltage = (analogValue / 1023.0) * referenceVoltage * resistorDividerRatio;

  // Print the output voltage to the serial monitor
  Serial.print("Output Voltage: ");
  Serial.print(outputVoltage);
  Serial.println(" V");

  delay(1000); // Wait for 1 second before the next reading
}

1. No Output Voltage:

   • Ensure the EN pin is pulled high to enable the device.
   • Check the input voltage to confirm it is within the specified range.
   • Verify the feedback resistor network is correctly configured.

2. Excessive Output Ripple:

   • Use low-ESR capacitors for input and output filtering.
   • Ensure the inductor value is appropriate for the desired output current.

3. Overheating:

   • Check for proper thermal management and adequate PCB copper area.
   • Ensure the output current does not exceed the maximum rating.

4. Device Not Switching:

   • Verify the RT/CLK pin configuration for proper switching frequency.
   • Check the bootstrap capacitor connection between BOOT and SW pins.

Q: Can the TPS54x60 be synchronized with an external clock?
A: Yes, the RT/CLK pin can accept an external clock signal for synchronization.

Q: What is the maximum output current of the TPS54x60?
A: The maximum output current depends on the specific model within the TPS54x60 family, but it can go up to 6 A.

Q: How do I calculate the feedback resistor values?
A: Use the formula provided in the datasheet:
( V_{OUT} = V_{REF} \times (1 + \frac{R1}{R2}) ),
where ( V_{REF} ) is typically 0.8 V.

Q: Can I use the TPS54x60 for battery-powered applications?
A: Yes, its high efficiency and wide input voltage range make it suitable for battery-powered systems.